Customer Question of the Day
“I have wooden north-facing, rain-exposed window frames. The white painted frames have taken a beating and there is already some rot showing. Does Danish Oil (and the VOC version) leave the wood waterproof? How good is the UV protection? And do they contain tung oil?”
Below are our answers.
Does Danish Oil leave wooden window frames waterproof?
All of our oils are water repellent, which is slightly different from being fully waterproof.
A water-repellent wooden window frame treatment allows moisture that penetrates the wood to evaporate back out. This is critical for exterior frames. When moisture becomes trapped — often under flaking paint — it soaks into the wood and remains there, which is the primary cause of rot.
By allowing the wood to breathe, Danish Oil helps reduce long-term moisture damage while still offering excellent protection from rain.
How good is the UV protection?
All Gobelins exterior oils contain high-quality UV protection and biocides to help prevent mildew and fungal growth.
Our tinted oils, such as Deck Oils, offer even stronger UV resistance thanks to transparent iron oxide pigments. These pigments filter harmful UV rays while still allowing the natural grain of the wood to show through — ideal for exterior wooden window frames exposed to sun for long periods.
Do Danish Oils contain tung oil?
No — our Danish Oils do not contain tung oil.
However, we do offer Pure Tung Oil and Tung Oil Blend for those specifically looking for tung-based products. The key difference is that in Danish Oil formulations, linseed oil is used, whereas tung oil replaces linseed oil in our Tung Oil Blend.
Both systems perform exceptionally well; the choice depends on the look, feel, and maintenance preference you’re after.
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Ongoing care for exterior wooden window frames
One of the most important steps in keeping exterior wooden window frames in good condition is annual maintenance. Regular re-oiling prevents moisture ingress, slows UV damage, and dramatically extends the life of the wood.
The ease of application of Gobelins Danish & Deck Oils makes this an achievable, once-a-year task — far simpler than stripping, repainting, and repairing rot later on.
Hi Gary,
Thanks for contacting us and also your question through the website.
To answer, we have several options for you to use on your window frames. Both our Deck Oils and Danish Oil Original, are completely compatible with over-coating with PVA and Enamel paint. In fact it is advantageous to do that as the Oils make a very good primer for paint as they bond well onto the surface of the timber and enables the paint to bond better and last longer.
This is a technique used widely in America with a product called ‘The Madison Formula’ in the 1900’s and if you’d like more information, there is quite a lot about it on the net.
Please feel free to contact us should you have any further questions.
Kind regards,
The WoodCare Guy